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Vol. 158, Issue 11, November 2013, pp. 225-229




Mechanical Sensor by Water Contact Observed from a Seed Capsule of Pletekan Plant (Ruellia Tuberosa L.)
1,2 Hariyadi SOETEDJO, 1 Bagus HARYADI, 1 Farid IMAM

1 Study Program of Physics (Metrology-Electronics-Instrumentations), FMIPA, Universitas Ahmad Dahlan, Jalan Yogyakarta 55164, Indonesia. 2 Center for Integrated Research and Innovation (CIRNOV-UAD), Universitas Ahmad Dahlan, Jalan Cendana No 9A, Yogyakarta 55166, Indonesia
Tel.: +62-274-563515, fax. +62-274-564604
E-mail: hariyadi@uad.ac.id


Received: 16 September 2013   /Accepted: 25 October 2013   /Published: 30 November 2013

Digital Sensors and Sensor Sysstems


Abstract: Mechanical sensor phenomenon has been observed from seed capsules of tropical plant of Pletekan (Ruellia tuberosa L.). The capsules were taken from the plant and put on the water for an observation. Mechanical crack / explosion will occur a few seconds after make a contact with water. Time required by a capsule to crack from an initial contact called as explosion time. Ultrasonic apparatus was used to determine the explosion time through the ultrasonic wave (40 kHz) reflection off the water surface where the capsule triggers the water's ripple. The parameters involved in this phenomenon are length and weight of capsule. From the experiment, the increase of ratio (length over weight of capsule) from 240 to 340 will be followed by the increase of explosion time exponentially from about 5 to 60 s. This result is interesting as visual cracking phenomenon from capsule of natural plant could be observed and potentially to be used for further applications.


Keywords: Cracking plant, Explosion time, Pletekan, Ruellia tuberosa.


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